Question 1

Cardiac muscle is located in the walls of blood vessels.

Accepted Answer

A) True 
 B)False

Question 2

Troponin, tropomyosin and actin are all parts of the thin filaments.

Accepted Answer

A) True 
 B)False

Question 3

What is the product of the aerobic breakdown of glucose?

Accepted Answer

A)   Creatine phosphate
B)   Pyruvic acid
C)   Lactic acid
D)   Carbon dioxide, water, and ATPE) B) and C)
F) A) and B)

Question 4

Acetylcholinesterase breaks down the cross-bridge linkages between myosin to actin.

Accepted Answer

A) True 
 B)False

Question 5

By what means does an electrical impulse travel deep into a skeletal muscle fiber in order to trigger a contraction?

Accepted Answer

A)   Via the sarcoplasmic reticulum
B)   Via transverse tubules
C)   Via mitochondria
D)   Via motor end plates
E)   Via gap junctionsF) B) and E)
G) All of the above

Question 6

One factor that may contribute to the development of muscle fatigue is an accumulation of the __________ resulting from anaerobic metabolism.

Accepted Answer

The answer of One factor that may contribute to the...

Question 7

Cardiac muscle is located in the walls of blood vessels.

Accepted Answer

A) True 
 B)False

Question 8

Small, sustained contractions that are the result of repeated nervous stimulation, originating from the spinal cord and stimulating only a few muscle fibers at a time, is called __________.

Accepted Answer

A)   muscle tone
B)   tetanus
C)   summation
D)   a myogram
E)   a twitchF) A) and B)
G) A) and E)

Question 9

What happens to a muscle that has lost its innervation?

Accepted Answer

A)   It undergoes hypertrophy.
B)   It stimulates the formation of new motor neurons.
C)   It undergoes atrophy.
D)   The muscle fibers enlarge in order to still undergo contraction.E) B) and C)
F) A) and D)

Question 10

In muscle anatomy, what is an origin?

Accepted Answer

A)   The less movable end of a muscle
B)   The more movable end of the muscle
C)   The point of attachment of a tendon to a muscle
D)   The location of a neuromuscular junction
E)   The boundary between neighboring sarcomeresF) None of the above
G) All of the above

Question 11

What structure within a skeletal muscle cell extends from Z line to Z line?

Accepted Answer

A)   Sarcolemma
B)   Sarcomere
C)   Sarcoplasmic reticulum
D)   A band
E)   I bandF) None of the above
G) C) and D)

Question 12

Consider a muscle that originates on the anterior forearm and inserts on the palm of the hand. What is the action of this muscle?

Accepted Answer

A)   To flex the wrist
B)   To flex the elbow
C)   To extend the wrist
D)   To extend the elbowE) A) and D)
F) A) and C)

Question 13

What structures form a motor unit?

Accepted Answer

A)   Several motor neurons and one muscle fiber
B)   One motor neuronand several muscle fibers
C)   Several motor neurons and several muscle fibersD) None of the above
E) B) and C) B

Question 14

What are fascicles?

Accepted Answer

A)   Bundles of muscle fibers
B)   Bundles of collagen fibers
C)   Bundles of myofibrils
D)   Bundles of thick and thin filaments
E)   Bundles of smooth muscle cellsF) C) and D)
G) A) and B)

Question 15

Using the muscle name as a clue, where is the tibialis posterior muscle located?

Accepted Answer

A)   At the buttocks
B)   At the back of the calf
C)   At the back of the arm
D)   Over the top of the foot
E)   Deep to the shoulder bladeF) A) and B)
G) A) and C)

Question 16

What muscle can act as a prime mover for plantar flexion of the foot?

Accepted Answer

A)   Gastrocnemius
B)   Tibialis anterior
C)   Extensor digitorum longus
D)   Biceps femorisE) B) and C)
F) A) and B)

Question 17

The enzyme ATPase is located in the heads of myosin molecules.

Accepted Answer

A) True 
 B)False

Question 18

Motor neurons communicate with muscle cells by releasing chemicals called ____________.

Accepted Answer

A)   neurotransmitters
B)   proteins
C)   myosin
D)   troponin
E)   tropomyosinF) A) and B)
G) B) and E) A

Question 19

What is muscle atrophy?

Accepted Answer

A)   Decrease in size and strength
B)   Increase in number of muscle fibers
C)   Increase in size of muscle fibers
D)   Decrease in length of muscle fibersE) B) and C)
F) A) and D)

Question 20

What enzyme catalyzes the breakdown of the neurotransmitter used to stimulate skeletal muscle?

Accepted Answer

A)   Tropomyosin
B)   ATPase
C)   Acetylcholinesterase
D)   NorephinephrineE) B) and C)
F) All of the above C

Exam 8: Muscular System

Cardiac muscle is located in the walls of blood vessels.

Correct AnswerverifiedShow Answer

Troponin, tropomyosin and actin are all parts of the thin filaments.

Correct AnswerverifiedShow Answer

What is the product of the aerobic breakdown of glucose?

Correct AnswerverifiedShow Answer

Acetylcholinesterase breaks down the cross-bridge linkages between myosin to actin.

Correct AnswerverifiedShow Answer

By what means does an electrical impulse travel deep into a skeletal muscle fiber in order to trigger a contraction?

Correct AnswerverifiedShow Answer

One factor that may contribute to the development of muscle fatigue is an accumulation of the __________ resulting from anaerobic metabolism.

Correct AnswerverifiedShow Answer

Cardiac muscle is located in the walls of blood vessels.

Correct AnswerverifiedShow Answer

Small, sustained contractions that are the result of repeated nervous stimulation, originating from the spinal cord and stimulating only a few muscle fibers at a time, is called __________.

Correct AnswerverifiedShow Answer

What happens to a muscle that has lost its innervation?

Correct AnswerverifiedShow Answer

In muscle anatomy, what is an origin?

Correct AnswerverifiedShow Answer

What structure within a skeletal muscle cell extends from Z line to Z line?

Correct AnswerverifiedShow Answer

Consider a muscle that originates on the anterior forearm and inserts on the palm of the hand. What is the action of this muscle?

Correct AnswerverifiedShow Answer

What structures form a motor unit?

Correct AnswerverifiedB

What are fascicles?

Correct AnswerverifiedShow Answer

Using the muscle name as a clue, where is the tibialis posterior muscle located?

Correct AnswerverifiedShow Answer

What muscle can act as a prime mover for plantar flexion of the foot?

Correct AnswerverifiedShow Answer

The enzyme ATPase is located in the heads of myosin molecules.

Correct AnswerverifiedShow Answer

Motor neurons communicate with muscle cells by releasing chemicals called ____________.

Correct AnswerverifiedA

What is muscle atrophy?

Correct AnswerverifiedShow Answer

What enzyme catalyzes the breakdown of the neurotransmitter used to stimulate skeletal muscle?

Correct AnswerverifiedC

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B

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A

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C